import React from 'react'
import { NavLink, Outlet, useNavigate } from 'react-router-dom'

export default function Main() {
    // useNavigate()还有一个功能叫做历时回退
    // 调用之后会返回一个回调函数
    const navigate = useNavigate()
    return (
        <div>
            <div>
                <div className="row">
                    <div className="col-xs-offset-2 col-xs-8">
                        <div className="page-header"><h2>React Router Demo</h2></div>
                        <button onClick={() => { navigate(1) }}>前进</button>
                        <button onClick={() => { navigate(-1) }}>后退</button>
                    </div>
                </div>
                <div className="row">
                    <div className="col-xs-2 col-xs-offset-2">
                        <div className="list-group">
                            <NavLink className="list-group-item" to="/main/about">About</NavLink>
                            <NavLink className="list-group-item" to="/main/home">Home</NavLink>
                        </div>
                    </div>
                    <div className="col-xs-6">
                        <div className="panel">
                            <div className="panel-body">
                                {/* Outlet跳转二级路由页面,类似于标识 */}
                                <Outlet />
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    )
}
